PDF malware analysis — malicious · eb2fa0135e4e1f53

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 14:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: f72a9c18f75536518b3a106729397d9a SHA-1: e3ddf3b1dd004e4b2d248bb62f30c61bfe23eaf2 SHA-256: eb2fa0135e4e1f53d7fddf92bb7d63d595e567e176e219d249f3321df6b89854

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://altstudio.be/app/webroot/uploads/file/42894979766.pdf In PDF document text
- http://budaors.varosom.hu/userfiles/files/vozolugis.pdfIn PDF document text
- https://www.aukuras.org/ckfinder/userfiles/files/xulabupikujelareker.pdfIn PDF document text
- http://www.hussco-steel.com/husscofiles/files/nalukudorixowibiwix.pdfIn PDF document text
- http://esistore.com/userfiles/file/61712024583.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5f0003a8---68860420483.pdfIn PDF document text
- http://incomingmakedonia.com/files/files/fugupo.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/80db14daee4ad574dc5304e15a33e76a/sirorisoxenorew.pdfIn PDF document text
- http://kasand.com/userfiles/sowiboxanogojozijipigiv.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5a44acfd---faxorirogajifojukus.pdfIn PDF document text
- https://okazionche.com/files/rulemixefegila.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c417d9bcd332b9c9287f13c50c15d47c/14545091438.pdfIn PDF document text
- https://maftplayer.net/calisma2/files/uploads/38270443452.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613838d964f89---83309452853.pdfIn PDF document text
- https://csn-alliance.com/data/files/7672475825.pdfIn PDF document text
- http://benthanhsgfarm.com/images/uploads/files/77765132745.pdfIn PDF document text
- http://moscowfashion.net/content/xuploadimages/file/tuputim.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/jonubezuloxabisemi.pdfIn PDF document text
- https://tomorrowhubs.com/upload/users/files/lodekuwosuzamivu.pdfIn PDF document text
- https://weishinclinic.com/uploads/files/202109021521283428.pdfIn PDF document text
- http://kovacsoltvaskerites.hu/images/file/jemagagunibisif.pdfIn PDF document text
- http://pointerboards.com/uploads/admin/files/54864131001.pdfIn PDF document text
- https://woft-dining.com/webroot/editor-uploads/files/wofavewu.pdfIn PDF document text
- http://www.jacenter.org/js/ckfinder/userfiles/files/41402865596.pdfIn PDF document text
- http://cesnek-vysocina.cz/UserFiles/File/nagaw.pdfIn PDF document text
- https://tattica.byespresso.com/app/webroot/files/upload/files/bamukotizedabogagukavi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ibis+paint+new+versionPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bab8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAB8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d2cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2CF	10440 bytes
SHA-256: `1dc83881b77268fc81dfc3ea49d9cc828a0f44f8ea3b1e693e6634dfd5b54d99`
`font_02_sfnt_off0000ea84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA84	15760 bytes
SHA-256: `4ff9af40e15f381593ec961531fb067c10191ec492f5a39dfd657ade3d76cf41`

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